MGTT 

"More gums than teeth" when a person smiles and they display more gums than teeth

Mehn that girl has MGTT

MGTT by Antwan739 July 20, 2012

MGTTC 

An acronym of ‘Mountain Goat To The Cooch’, similar to a hit in the male groin, it is usually used to describe a kick, knee, punch, slap, elbow, stomp, bite etc. to the genital area

Geez that was a real mgttc

MGTTC by Let them eat kek January 27, 2020